Just watched a video about the GM plant and the building of the ZO6 in particular... they clearly state that they went to a dry sump for TWO reasons:
1) They can pull over a G in steady cornering... and in the video, demonstrated the movement of liquid and how it climbs walls.
2) They had "no room" for a DEEP sump pan with the low ground clearance.
So my take away from that is - that had they been able to do a "proper" pan - then they may have chosen to go with a wet sump.
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